docs: def character_nodes_stat_delta(self, char, *, store=True):
          """Return a dictionary of ``node_stat_delta`` output for each node in a
          character.
  
          """
          r = {}
          nodes = set(self._real.character[char].node.keys())
          for node in nodes:
              delta = self.node_stat_delta(char, node, store=store)
              if delta:
                  r[node] = delta
          nsc = self._node_stat_cache[char]
          for node in list(nsc.keys()):
              if node not in nodes:
                  del nsc[node]
          return r